CN102607425A - Steel rail or bridge displacement monitoring device for fiber Bragg grating transformation ring - Google Patents
Steel rail or bridge displacement monitoring device for fiber Bragg grating transformation ring Download PDFInfo
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- CN102607425A CN102607425A CN2012100724131A CN201210072413A CN102607425A CN 102607425 A CN102607425 A CN 102607425A CN 2012100724131 A CN2012100724131 A CN 2012100724131A CN 201210072413 A CN201210072413 A CN 201210072413A CN 102607425 A CN102607425 A CN 102607425A
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Abstract
The invention provides a steel rail or bridge displacement monitoring device for a fiber Bragg grating transformation ring. The steel rail or bridge displacement monitoring device consists of a fixing clamp assembly, a connection assembly, a fiber Bragg grating transformation ring assembly, a pull rod assembly and a sensor shell device. One part of the steel rail or bridge displacement monitoring device is fixedly arranged on a steel rail or a beam body to be measured of the bridge, and the other part of the steel rail or bridge displacement monitoring device is fixedly arranged on a ballastless rail bed or a bridge reference beam body. The two parts of the steel rail or bridge displacement monitoring device are connected through the connection assembly. Two fiber Bragg gratings with different wavelengths are vertically cured on a rigid round ring. Force generated by that a target to be measured is displaced is transmitted to the rigid round ring through a pull ring and a spring, so that the two fiber Bragg gratings are inversely stressed. A center wavelength is offset to an inverse direction, so as to obtain the displacement of the target to be measured by overlapping the wavelength offset values. Therefore, the optical signal aberration generated by directly sticking the gratings is avoided and the interference caused by an environment temperature is omitted. The steel rail or bridge displacement monitoring device is applicable to long-term online monitoring, and is sensitive, stable, reliable, compact in structure and convenient to repair and maintain.
Description
Technical field
The present invention relates to the steel rail displacement on the railway ballastless railway roadbed, or railroad bridge free beam or continuous beam telescopic displacement monitoring technical field and fiber grating sensing technology field.Be specially a kind of rail or bridge displacement monitor of fiber grating Shape-changeable ring.
Background technology
The railway traffic transportation plays a part very important in national economy, and rail and bridge are the infrastructure of transportation by railroad.Starting in a large number along with heavy duty and speed-increase train in recent years; And the building and open-minded of many high-speed railways visitor special line roads; Monitoring requirement to its infrastructure is also just increasingly high; The crucial technological means of research and development is monitored its running status parameter, guarantees that its safe operation just seems very important.
Because the expansion displacement that the temperature difference produces, the variation of geology and the factors such as train of going all have the acting force of different directions to rail, make that the rail on the track circuit produces displacement in various degree.At present the ratio on the tunnel of high ferro circuit and bridge the line is busy road is near more than half, and bridge itself and the degree of the distortion that rail produced and displacement on the bridge of being installed in can be bigger.
The displacement of rail and bridge beam body directly has influence on the safety of train driving, and therefore the monitoring for these displacements is the indispensable part of current railway track status monitoring.The expert quite payes attention to this technology both at home and abroad, also all adopts the different techniques means to come it is measured.For example, through means displacement monitoring amounts such as laser displacement gauge, capacitive displacement transducer and video imagings, but these monitoring meanss all have defective in various degree, are especially adapting to aspects such as on-the-spot rugged surroundings and measuring accuracy.The laser displacement monitoring needs manually-operated, measuring accuracy is limited and can not realize measuring automatically etc.; Capacitive displacement transducer exists temperature influence to cause measuring error because constitute the difference of sensor material; Edge effect also can make transducer sensitivity descend and nonlinear increase, and other foreign matter of rail or people's interference produces stray capacitance and causes sensor characteristic unstable; The video imaging technology receives environmental pollution to need wiping camera and scale, and the fragile equipment of inclement weather.
The distinguishing feature of fiber grating sensing technology is that long-time stability are good, can not produce the zero point drift of electric signal sensor, it for the long term monitoring of engineering provides maybe.The present invention is applied to optical fiber sensing technology in the displacement monitoring, and the pitch through pull rod device change fiber grating makes the center wavelength variation of its reflection realize the monitoring to steel rail displacement or railroad bridge free beam or continuous beam telescopic displacement.
Summary of the invention
The object of the invention aims to provide rail or bridge displacement monitor, promptly a kind of rail of fiber grating Shape-changeable ring or the bridge displacement monitor that a kind of long-time stability are good, measurement is accurate, safe and reliable, corrosion-resistant, not influenced by variation of ambient temperature.
Realize the technical scheme of the object of the invention:
A kind of rail of fiber grating Shape-changeable ring or bridge displacement monitor, this device is made up of geometrical clamp assembly, coupling assembling, fiber grating annular displacement sensing assembly, rod assembly and sensor shell body device; Wherein the geometrical clamp assembly comprises the rail geometrical clamp and fixes to clamp fixing bolt, and the geometrical clamp assembly is held on tested rail foot both sides through the rail geometrical clamp, and is through fixing to clamp fixing bolt that it is fastening; Its coupling assembling comprises steel plate, steel plate set bolt, fixed mount set bolt, connects the cable wire fixed mount, connects the cable wire fastening bolt, connects the cable wire set bolt and be connected cable wire; Its steel plate set bolt is fixed in the rail geometrical clamp outside with steel plate; Connect the cable wire fixed mount and schedule the steel plate outside by the fixed mount set bolt; Connect cable wire one end and be fixed on the connection cable wire fixed mount by connecting the cable wire fastening bolt, the other end is fixed on the pull bar through connecting the cable wire set bolt;
Described fiber grating annular displacement sensing assembly comprises the 1st optical fiber, the 2nd optical fiber and rigid; Its 1st optical fiber is with the 1st grating; The 2nd optical fiber is with the 2nd grating; The 1st grating and the 2nd grating are that the fiber grating that constitutes of two fiber gratings of different wave length is right, and fiber grating fixedly steel pipe laser bonding and is in vertical distribution on rigid; The 1st optical fiber) and the 2nd optical fiber pass fixedly steel pipe and in vertical state of fiber grating respectively, make described fiber grating to being in the rigid circle centre position, fiber grating is solidificated in fiber grating fixedly in the steel pipe to stickup; Rigid is welded with two of relative direction along the 1st optical fiber and receives the arm of force, and the one of which end is fixed on the sensor protection box housing, and the other end links to each other with the pull bar that transmits displacement;
Its fiber grating annular displacement sensing assembly places in the sensor shell body device, and the sensor shell body device is fixed on the railway roadbed of non-fragment orbit by two pairs of fixing feet and four fixing feet set bolts; The sensor shell body device is made up of sensor protection box and pull bar protection tube; Rod assembly comprises pull bar, connects cable wire set bolt and spring, and an end of spring is connected on the rigid, and the mounting hole of the other end through pull bar is with to be connected cable wire continuous;
For telescopic displacement between monitoring bridge free beam or continuous beam beam body, the fixing feet that then will connect cable wire fixed mount and sensor shell body device is separately fixed on the tested beam body of bridge and on the datum line beam body.
In the monitoring device of the present invention, described the 1st optical fiber and the 2nd optical fiber are for there being the prestretching strain regime.
In the monitoring device of the present invention, the wavelength of described the 1st grating is greater than the wavelength of the 2nd grating.
In the monitoring device of the present invention, described fiber grating is solidificated in fiber grating fixedly in the steel pipe to stickup, unsettled placement, and the grating of avoiding optical fiber partly is stuck and the distortion that produces light signal.
The monitoring range of monitoring device of the present invention is regulated through the length that changes pull bar, pull bar protection tube and spring, and through accurate displacement calibrating.
Pull bar is the movable members of the sensor housing that fixes on the ground; During installation pull bar is fixed on the point midway of range of displacement measurement; An end that connects cable wire is fixed in the mounting hole on the pull bar, and the other end is fixed in the hole of the cable wire fixed mount on the rail.
The sensor shell body device is the stationary parts fastening with the earth, and it provides the benchmark of displacement measurement.If telescopic displacement between the beam body of free beam or the continuous beam of monitoring bridge then directly is fixed on above-mentioned connection rail geometrical clamp and casing device on the tested beam body of bridge and gets final product.
The sensor shell body device is made up of sensor protection box and pull bar protection tube, and there is fiber grating annular displacement sensing assembly sensor protection box inside; Pull bar and spring are arranged in the pull bar protection tube.One end of spring is linked to each other with pull bar; An other end is connected with the rigid of fiber grating; The pulling force that guarantees the suffered displacement of cable wire passes to rigid through pull bar and spring, makes the rigid axial direction receive pulling force, and vertical direction is stressed; Thereby make axial one of two fiber gratings on the annulus drawn a vertical pressurized.
Sensor of the present invention adopts the unsettled method of fiber grating.The grating department of two optical fiber is divided placed in the middle, stickup is solidified on rigid with being in vertical distribution, makes the grating on the every optical fiber be positioned at the rigid home position, and the grating of having avoided optical fiber partly is stuck and the warbling distortion that produces light signal.And two optical fiber that require to be pasted on the rigid receive prestretching to a certain degree.
Two fiber gratings of the present invention are two gratings of different wave length.When rail or bridge are subjected to displacement; The power that its displacement produced passes to spring through cable wire and pull bar; Cause spring to be stretched or compress, the rigid that at this moment links to each other with spring is also stretched or is compressed, and one on grating on two optical fiber is drawn a pressurized.Like this, the reverse direction skew has taken place in the centre wavelength of two gratings, and the stack of its wavelength displacement value is the deformation quantity of rigid, thereby obtains the displacement of testee, and the interference that causes because of variation of ambient temperature has also been offset in the stack of wavelength shift.
The measurement range of the monitoring device that the present invention relates to can change through the length of pull bar, protection tube and spring, and through accurate displacement calibrating.
Characteristics of the present invention and advantage
1, fiber Bragg grating strain sensor of the present invention adopts loop configuration; Solved better because of fiber grating and be stuck and use the warbling of fiber grating that causes to produce optical signal distortion for a long time; Make sensor lose accurate problem, also solved the stability problem of sensor construction well, make its measuring accuracy stable for extended periods of time, accurately; Two sensing gratings receive the power of different directions respectively; After their the wavelength shift value stack, not only increase sensitivity, and offset the wavelength shift that variation of ambient temperature produces;
2, because fiber grating sensing technology utilizes the wavelength of grating to monitor, have characteristics reliably and with long-term, so the zero signal in its original position is steady in a long-term, can not produce zero point drift, this is that electric signal sensor is not available;
3, the present invention adopts fiber grating sensing technology, can realize monitoring on-the-spot no electric signal, and has the characteristics of the electromagnetic interference (EMI) of not receiving, and has avoided because on-the-spot electric signal is prone to by the interference of electric locomotive strong-electromagnetic field and causes monitoring to lose problems such as accurate.Make monitoring accuracy of the present invention be guaranteed;
4, monitoring device of the present invention makes whole device be installed on the rail outside respectively with rail geometrical clamp and ground stationary installation and does not have on the tiny fragments of stone, coal, etc. railway roadbed; Such installation form has avoided influencing in orbit the operating type that railway interests such as boring or the welding of track structure ban use of; And device volume is little, simple in structure, and can not go to bullet train impacts;
5, strong, the displacement monitoring, the long service life that are applicable to infrastructure such as bridge, highway of easy for installation, the reliable in function of monitoring device of the present invention, extensibility, be convenient to care and maintenance etc.
Description of drawings
Fig. 1 is a monitoring device mounting structure synoptic diagram of the present invention.
Fig. 2 is a monitoring device sectional side view of the present invention.
Among the figure: 1 rail; 2 rail geometrical clamps; 3 fix to clamp fixing bolt; 4 steel plates; 5 steel plate set bolts; 6 fixed mount set bolts; 7 connect the cable wire fixed mount; 8 connect the cable wire fastening bolt; 9 connect cable wire; 10 connect the cable wire set bolt; 11 pull bar protection tubes; 12 fixing feet set bolts; 13 fixing feet; 14 sensor protection boxes; 15 fiber optic protection holes; 16 optical cables; 17 sensor protection box fastening bolts; 18-1 the 1st optical fiber, 18-2 the 2nd optical fiber; 19 rigid; 20-1 the 1st grating; 20-2 the 2nd grating; 21 springs; 22 pull bars; 23 roadbed railway roadbeds; 24 sleepers.
Embodiment
Further specify below in conjunction with the structure and the mounting means of accompanying drawing the steel rail displacement monitoring device of fiber grating Shape-changeable ring of the present invention.
Like Fig. 1, shown in 2, this monitoring device is made up of geometrical clamp assembly, coupling assembling, fiber grating annular displacement sensing assembly, rod assembly and sensor shell body device.During the monitoring steel rail displacement, whole device is installed between two sleepers 24.
The geometrical clamp assembly by rail geometrical clamp 2 with fix to clamp fixing bolt 3 and be fixed in rail 1 two bottom sides, require its fastening non-loosening, to guarantee the accuracy of displacement measurement.Again steel plate 4 usefulness steel plate fastening bolts 5 are fixed on rail geometrical clamp 2 outsides (be rail outside the), and will connect cable wire fixed mount 7 usefulness fixed mount fastening bolts 6 and be fixed in steel plate 4 outsides.The sensor shell body device then uses two pairs of fixing feet 13 and four fixing feet set bolts 12 to be fixed on the firm no tiny fragments of stone, coal, etc. railway roadbed 23 in tested rail 1 outside, has guaranteed the stable of displacement measurement benchmark.To connect cable wire 9 one ends again and pass the hole that connects on the cable wire fixed mount 7, and use connection cable wire fastening bolt 8 that it is fastening; The other end penetrates in the pull bar 22, and makes it fastening with connecting cable wire set bolt 10.Such installation makes monitoring device be connected between tested rail 1 and the static railway roadbed 23, the displacement situation of 1 pair of static the earth of monitoring rail.The range that especially will attentively be displacement transducer must be greater than 2 times of actual displacement; And make the spring 21 in the sensor device receive the half the prestretched of its range; Make that how no matter testee move forwards, backwards, can both guarantee in the displacement monitor monitoring range.
And the structure of the displacement monitor of bridge with install simplyr, will connect cable wire fixed mount 7 separately to rotate to installed surface down, be fixed on the tested beam, two fixing feet 13 of sensor shell body device be fixed on the matrix beam get final product.
The installation of the optical fiber grating sensing assembly of displacement transducer is as shown in Figure 2; In sensor protection box 14; One with rigid 19 be fixed in the sensor protection box 14 by the arm of force, linked to each other with pull bar protection tube 11 interior springs 21 by the arm of force another, and the other end of spring 21 links to each other with pull bar 22; Pull bar 22 again be connected cable wire 9 and link to each other, transmit displacement.Spring 21 stretched or when pushing acting force can be delivered to effectively on the 1st fiber grating 20-1 and the 2nd fiber grating 20-2 of rigid 19.When 21 elongations of pull bar 22 pulling springs, the 1st fiber grating 20-1 of rigid 19 receives pulling force, and the 2nd fiber grating 20-2 is stressed; Otherwise when pull bar 22 shortened spring 21, the 1st fiber grating 20-1 of rigid 19 was stressed, and the 2nd fiber grating 20-2 receives pulling force.The 1st optical fiber 18-1 and the 2nd optical fiber 18-2 series connection back one end are unsettled or be connected in series to next displacement transducer, and the other end inserts optical cable 16 and is drawn out to the pulpit.
Claims (5)
1. the rail of a fiber grating Shape-changeable ring or bridge displacement monitor is characterized in that: this device is made up of geometrical clamp assembly, coupling assembling, fiber grating annular displacement sensing assembly, rod assembly and sensor shell body device; Wherein the geometrical clamp assembly comprises rail geometrical clamp (2) and fixes to clamp fixing bolt (3), and the geometrical clamp assembly is held on tested rail (1) two bottom sides through rail geometrical clamp (2), and is through fixing to clamp fixing bolt (3) that it is fastening; Coupling assembling comprises steel plate (4), steel plate set bolt (5), fixed mount set bolt (6), connects cable wire fixed mount (7), connects cable wire fastening bolt (8), connects cable wire set bolt (10) and be connected cable wire (9); Steel plate set bolt (5) is fixed in rail geometrical clamp (2) outside with steel plate (4); Connect cable wire fixed mount (7) and be fixed in steel plate (4) outside by fixed mount set bolt (6); Connect cable wire (9) one ends and be fixed on the connection cable wire fixed mount (7) by connecting cable wire fastening bolt (8), the other end is fixed on the pull bar (22) through connecting cable wire set bolt (10);
Fiber grating annular displacement sensing assembly comprises the 1st optical fiber (18-1), the 2nd optical fiber (18-2) and rigid (19); Its 1st optical fiber is with the 1st grating (20-1); The 2nd optical fiber is with the 2nd grating (20-2); The 1st grating (20-1) and the 2nd grating (20-2) are that the fiber grating that constitutes of two fiber gratings of different wave length is right, and fiber grating fixedly steel pipe laser bonding and is in vertical distribution on rigid (19); The 1st optical fiber (18-1) and the 2nd optical fiber (18-2) pass fixedly steel pipe and in vertical state of fiber grating respectively, make described fiber grating to being in rigid (19) circle centre position, and fiber grating is solidificated in fiber grating fixedly in the steel pipe to stickup; Rigid (19) is welded with two of relative direction along the 1st optical fiber (18-1) and receives the arm of force, and the one of which end is fixed on sensor protection box (14) housing, and the other end links to each other with the pull bar (22) of transmission displacement;
Fiber grating annular displacement sensing assembly places in the sensor shell body device, and the sensor shell body device is fixed on the railway roadbed (23) of non-fragment orbit by two pairs of fixing feet (13) and four fixing feet set bolts (12); The sensor shell body device is made up of sensor protection box (14) and pull bar protection tube (11); Rod assembly comprises pull bar (22), connects cable wire set bolt (10) and spring (21), and an end of spring is connected on the rigid (19), and the mounting hole of the other end through pull bar (22) is with to be connected cable wire (9) continuous;
For telescopic displacement between monitoring bridge free beam or continuous beam beam body, the fixing feet (13) that then will connect cable wire fixed mount (7) and sensor shell body device is separately fixed on the tested beam body of bridge and on the datum line beam body.
2. the rail of a kind of fiber grating Shape-changeable ring according to claim 1 or bridge displacement monitor is characterized in that: described the 1st optical fiber (18-1) and the 2nd optical fiber (18-2) are for there being the prestretching strain regime.
3. the rail of a kind of fiber grating Shape-changeable ring according to claim 1 or bridge displacement monitor is characterized in that: the wavelength of described the 1st grating (20-1) is greater than the wavelength of the 2nd grating (20-2).
4. the rail of a kind of fiber grating Shape-changeable ring according to claim 1 or bridge displacement monitor; It is characterized in that: described fiber grating is solidificated in fiber grating fixedly in the steel pipe to stickup; Unsettled placement, the grating of avoiding optical fiber partly are stuck and the distortion that produces light signal.
5. the rail of a kind of fiber grating Shape-changeable ring according to claim 1 or bridge displacement monitor is characterized in that: the monitoring range of this monitoring device is regulated through the length that changes pull bar (22), pull bar protection tube (11) and spring (21).
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| CN201210072413.1A CN102607425B (en) | 2012-03-19 | 2012-03-19 | Steel rail or bridge displacement monitoring device for fiber Bragg grating transformation ring |
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| CN201210072413.1A CN102607425B (en) | 2012-03-19 | 2012-03-19 | Steel rail or bridge displacement monitoring device for fiber Bragg grating transformation ring |
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| CN102607425B CN102607425B (en) | 2014-07-02 |
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Cited By (14)
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| CN103215865A (en) * | 2013-04-03 | 2013-07-24 | 武汉理工大学 | Method for dynamically monitoring health states of railway continuous-beam bridge and rail overlapping device |
| CN103940359A (en) * | 2014-04-21 | 2014-07-23 | 武汉理工大学 | Fiber grating differential strain gauge and manufacturing and using method thereof |
| CN104034458A (en) * | 2014-06-25 | 2014-09-10 | 西南交通大学 | Fiber grating sensor based comprehensive on-bridge continuous welded rail test method |
| CN104442914A (en) * | 2014-09-30 | 2015-03-25 | 中国铁道科学研究院深圳研究设计院 | System for monitoring relative displacement between railway steel rail and rail board |
| CN106643491A (en) * | 2016-11-15 | 2017-05-10 | 北京交通大学 | Bridge micro-displacement sensing system based on double-core fiber |
| CN108645635A (en) * | 2018-05-30 | 2018-10-12 | 武汉理工大学 | Wheel track testing stand based on fiber grating and its contact force measuring method |
| CN108692669A (en) * | 2018-03-26 | 2018-10-23 | 林和光 | A kind of fiber-optic grating sensor for railroad track meter shaft |
| CN108960621A (en) * | 2018-06-27 | 2018-12-07 | 中南大学 | The bridge monitoring and evaluation method of high-speed rail bridge are worn under a kind of shield tunnel construction |
| CN109029236A (en) * | 2018-07-25 | 2018-12-18 | 中铁第四勘察设计院集团有限公司 | It is a kind of to eliminate the engineering structure mechanical strain test method and device that temperature influences |
| CN109405762A (en) * | 2018-11-15 | 2019-03-01 | 中铁第四勘察设计院集团有限公司 | A kind of anti-collision monitoring device based on fiber grating |
| CN112268797A (en) * | 2020-10-09 | 2021-01-26 | 武汉威思顿环境系统有限公司 | All-round comprehensive detector in tunnel |
| CN113029407A (en) * | 2021-03-25 | 2021-06-25 | 北京康拓红外技术股份有限公司 | Ruler type wheel-rail force continuous measurement fiber bragg grating sensing device and arrangement method thereof |
| CN115574724A (en) * | 2022-11-15 | 2023-01-06 | 西南交通大学 | Railway turnout movable steel rail displacement monitoring device, monitoring method and evaluation method |
| CN116164660A (en) * | 2023-04-21 | 2023-05-26 | 安徽省七星工程测试有限公司 | Fiber bragg grating dynamic deflection monitor and monitoring method |
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| CN103215865A (en) * | 2013-04-03 | 2013-07-24 | 武汉理工大学 | Method for dynamically monitoring health states of railway continuous-beam bridge and rail overlapping device |
| CN103940359A (en) * | 2014-04-21 | 2014-07-23 | 武汉理工大学 | Fiber grating differential strain gauge and manufacturing and using method thereof |
| CN103940359B (en) * | 2014-04-21 | 2017-02-01 | 武汉理工大学 | Fiber grating differential strain gauge and manufacturing and using method thereof |
| CN104034458A (en) * | 2014-06-25 | 2014-09-10 | 西南交通大学 | Fiber grating sensor based comprehensive on-bridge continuous welded rail test method |
| CN104034458B (en) * | 2014-06-25 | 2016-04-06 | 西南交通大学 | Based on the seamless turnout on bridge rail integrated test facility of fiber-optic grating sensor |
| CN104442914A (en) * | 2014-09-30 | 2015-03-25 | 中国铁道科学研究院深圳研究设计院 | System for monitoring relative displacement between railway steel rail and rail board |
| CN104442914B (en) * | 2014-09-30 | 2017-02-01 | 中国铁道科学研究院深圳研究设计院 | System for monitoring relative displacement between railway steel rail and rail board |
| CN106643491A (en) * | 2016-11-15 | 2017-05-10 | 北京交通大学 | Bridge micro-displacement sensing system based on double-core fiber |
| CN108692669B (en) * | 2018-03-26 | 2024-03-26 | 林和光 | Fiber bragg grating sensor for railway track axle |
| CN108692669A (en) * | 2018-03-26 | 2018-10-23 | 林和光 | A kind of fiber-optic grating sensor for railroad track meter shaft |
| CN108645635A (en) * | 2018-05-30 | 2018-10-12 | 武汉理工大学 | Wheel track testing stand based on fiber grating and its contact force measuring method |
| CN108960621A (en) * | 2018-06-27 | 2018-12-07 | 中南大学 | The bridge monitoring and evaluation method of high-speed rail bridge are worn under a kind of shield tunnel construction |
| CN108960621B (en) * | 2018-06-27 | 2020-09-29 | 中南大学 | Bridge monitoring and evaluating method for passing through high-speed rail bridge under shield tunnel construction |
| CN109029236A (en) * | 2018-07-25 | 2018-12-18 | 中铁第四勘察设计院集团有限公司 | It is a kind of to eliminate the engineering structure mechanical strain test method and device that temperature influences |
| CN109405762A (en) * | 2018-11-15 | 2019-03-01 | 中铁第四勘察设计院集团有限公司 | A kind of anti-collision monitoring device based on fiber grating |
| CN109405762B (en) * | 2018-11-15 | 2024-02-27 | 中铁第四勘察设计院集团有限公司 | Anti-collision monitoring device based on fiber bragg grating |
| CN112268797A (en) * | 2020-10-09 | 2021-01-26 | 武汉威思顿环境系统有限公司 | All-round comprehensive detector in tunnel |
| CN112268797B (en) * | 2020-10-09 | 2022-07-19 | 武汉威思顿环境系统有限公司 | All-round comprehensive detector in tunnel |
| CN113029407A (en) * | 2021-03-25 | 2021-06-25 | 北京康拓红外技术股份有限公司 | Ruler type wheel-rail force continuous measurement fiber bragg grating sensing device and arrangement method thereof |
| CN115574724A (en) * | 2022-11-15 | 2023-01-06 | 西南交通大学 | Railway turnout movable steel rail displacement monitoring device, monitoring method and evaluation method |
| CN116164660A (en) * | 2023-04-21 | 2023-05-26 | 安徽省七星工程测试有限公司 | Fiber bragg grating dynamic deflection monitor and monitoring method |
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